Run this by me again
1. Fact: sodium ions found in the ices of Saturn's outer ring.
2. Fact: sodium not observed in Enceladus plumes.
3. Conclusion: there exists a subterranean salt (NaCl) water (H20) ocean on/in Enceladus.
You have to hand it to these guys - they won't take no for an answer. They looked for water on comets - didn't find much (about 1% of what was expected). They looked for water on Mars - didn't find much (lots of protons on the surface, so all the water must be underground). And now they're looking on the Moon (polar craters) and anywhere there's have a chance of getting away with a quick modus tolens and a barrel of pork.